JP2001278355A - Packaging material for boiling, and packaging bag using the packaging material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a packaging material for boiling which stores fresh noodles, etc., and is excellent in the heat resistance and the curl characteristic during the boiling sterilization and also excellent in the moisture prevention during the distribution and preservation, and a packaging bag using it. SOLUTION: In the packaging material 1 for boiling which comprises an outermost layer of a biaxially oriented polyamide film and an innermost layer of a sealant layer 20, the sealant layer 20 is a multi-layered film comprising at least two layers which are laminated in the order of a polyethylene film 20a having the density of >=0.925 and a polyethylene film 20b having the density <0.25 from the outer side, and this multi-layered film is used for the packaging material 1 for boiling obtained by the common extrusion of the T-die method or the inflation method at the blow ratio of 1 to 1.5, and the packaging bag using it.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a boil packaging material for storing raw noodles and the like and for sterilizing the boiled noodles, and a packaging bag using the same.

[0002]

2. Description of the Related Art Conventionally, there is a packaging bag for boil which stores, for example, raw noodles and sterilizes in a boil at about 100 ° C. for about 30 minutes in a manufacturing process.
It is widely used as a packaging bag for ready-to-eat foods that are heated and eaten.

[0003] As a condition of the above-mentioned packaging bag for boil, a manufacturer fills with raw foods such as raw noodles, seals the opening, and then sterilizes in boil at about 100 ° C for about 30 minutes.
During sterilization of the boil, there is no breakage of the bag (hereinafter referred to as heat resistance. Without this heat resistance, the heat of the bag weakens due to the boil heat and leads to the breakage of the bag). (Hereinafter, referred to as curl characteristics. If an outer curl occurs in the hakama part, dirt and the like in the boiling water used for sterilizing boil enter into the outer curled hakama part and become unsanitary). During distribution and storage, it is required that the contents such as raw noodles do not dry (hereinafter referred to as moisture-proof properties. When the contents dry, the taste is reduced and the expiration date is shortened).

As a conventional packaging bag for boiling, for example, a biaxially stretched nylon film having a thickness of about 25 μm is used for the outer layer, and a non-stretched film having a thickness of about 40 μm is formed on the innermost layer through an adhesive for dry lamination. There has been a four-sided seal packaging bag in which a polypropylene film is laminated to form a packaging material, and the flow direction of the packaging material is top and bottom.

[0005]

However, in the above-mentioned conventional packaging bag for boil, there is no breakage during boil sterilization (excellent in heat resistance), but a slight outer curl is generated in the upper and lower skirt portions (curl). (Slightly inferior in properties), and there is a problem that the soil in the boiling water may cause the packaging bag to become unsanitary. Further, there is a problem that the contents such as raw noodles of the product are dried (lack of moisture resistance) during distribution and storage, and the expiration date is shortened.

The present invention has been made to solve the above-mentioned problems of the prior art, and it is an object of the present invention to provide a boiler which is excellent in heat resistance and curl characteristics during sterilization of boil, and excellent in moisture resistance during distribution and storage. A packaging material for packaging and a packaging bag using the same.

[0007]

Means for Solving the Problems In order to achieve the above-mentioned object in the present invention, first, in the invention according to claim 1, a boiler package comprising a biaxially stretched polyamide film as an outermost layer and a sealant layer as an innermost layer. Wherein the sealant layer is a multilayer film comprising at least two layers laminated in this order from the outside on a polyethylene film having a density of 0.925 or more and a polyethylene film having a density of less than 0.25. It is what it was.

According to the first aspect of the present invention, since a polyethylene film having a density of 0.925 or more is laminated on the sealant layer, the polyethylene film having a high density has a low moisture permeability, and thus is distributed and stored. A polyethylene film which is excellent in moisture resistance in a medium and has a high density can provide a packaging material for a boil which is excellent in heat resistance during sterilization of a boil since the adhesiveness of a seal portion is not deteriorated by boil heat.

Further, in the invention according to claim 2, the multilayer film is obtained by co-extrusion using a T-die method or an inflation method with a blow ratio of 1 to 1.5. It was used as packaging material.

According to the second aspect of the present invention, a polyethylene film having a density of 0.925 or less is laminated on the sealant layer, and the T-die method or the blow ratio of 1 to 1. Since the multi-layer sealant layer is co-extruded by the inflation method of No. 5, the multi-layer film is highly oriented in the flow direction and has a large heat shrinkage.

According to the third aspect of the present invention, in the first aspect,
Or a packaging bag using the boil packaging material described in 2.

According to the third aspect of the present invention, a packaging bag using a packaging material for boil, which is excellent in heat resistance, curl characteristics (inner curl) and moisture resistance, is used for sterilizing boil on the manufacturer side. It can be used as a (sanitary) packaging bag for boil free from breakage of bags and filth into the hakama.
Further, it is possible to provide a packaging bag for storing a biological food which does not dry during distribution and storage (has a long shelf life).

[0013]

Embodiments of the present invention will be described below with reference to the drawings. TECHNICAL FIELD The present invention relates to a packaging material for boil that stores raw noodles and the like and is sterilized in a boiler on the manufacturer side, and a packaging bag for boiling using the same. As shown in the figure, a boil packaging material (1) in which the outermost substrate film (10) is a biaxially stretched polyamide film and the innermost layer is a sealant layer (20)
It is.

As shown in FIG. 1, the boil packaging material (1) of the present invention uses, for example, a biaxially stretched nylon film for the outermost base film (10) and a dry lamination adhesive layer ( 30), from the outside with a density of 0.
As a sealant layer (20), a multilayer film composed of three layers laminated in the order of a polyethylene film (20a) of 925 or more, a polyethylene film (20b) having a density of less than 0.25, and a polyethylene film (20a) having a density of less than 0.925 is used. It is a laminate.

As long as the polyethylene film (20a) having a density of 0.925 or more is laminated on the outside, that is, on the side of the adhesive layer (30) as the sealant layer (20), two or four layers may be used. The ratio of each layer is also
It can be appropriately selected in consideration of the moisture resistance and the curl characteristics in addition to the size of the bag.

As described above, the sealant layer (20)
Since a polyethylene film having a low water vapor transmission rate and a density of 0.925 or more is laminated, it is possible to obtain a wrapping material for boil (1) which is more excellent in moisture resistance than a conventional unstretched polypropylene film. It is possible to form a packaging bag in which the content is less dried.

Further, in order to explain characteristics such as heat resistance and curl characteristics of the boil packaging material (1) of the present invention, the production of a packaging bag using the packaging material will be described below. First,
As shown in the perspective view of FIG. 2 (a), the wrapping material (1) for boil of the present invention is, for example, a multi-layer stretched nylon film as a base film (10) via an adhesive layer (30). A web-shaped boil packaging material (1) on which the sealant layer (20) is laminated is obtained.

Next, as shown in the perspective view of FIG. 2 (b), the web-shaped wrapping material for boil (1) obtained above is slit into a prescribed width (width of bag (W)). The sealant layers (20) are put together, and both side edges are sealed to form a side edge seal portion (12). At the same time, the vertical width of the bag is perpendicular to the flow direction (P) of the boil packaging material (1). The lower edge sealing portion (14) is formed by sealing at the interval (H). This web (winding) state is mounted on a filling machine for contents.

Next, as shown in the perspective view of FIG.
In the filling machine, the lower edge seal portion (1) of the web obtained above is obtained.
4) Cut parallel to the lower edge seal part (14) so as to form a hakama part (14a) at the lower part, and open the upper edge with an opening (40).
And a bag having

The contents are filled from the opening (30) of the bag, and as shown in the perspective view of FIG. 3, the upper edge opening is sealed to form an upper edge sealing portion (16). At this time, a hakama part (16a) is formed at the tip of the upper edge. In this state, boil sterilization is performed by immersing in hot water at about 100 ° C. for 30 minutes, and then cooled to obtain a commercial product.

In the above-mentioned boil sterilization, as shown in FIG. 1, the sealant layer (2) constituting the boil packaging material (1) is used.
0), a polyethylene film (20) having excellent heat resistance and a density of 0.925 or more was formed on the base film (10) side.
Since a) is laminated, it is possible to obtain a packaging bag for a boil free of breakage.

As shown in FIG. 1, during the above-mentioned boil sterilization, the sealant layer (20) constituting the boil packaging material (1) is subjected to a T-die method or a blow ratio of 1 to 10.
Co-extruded multilayer by inflation method of 1.5 (polyethylene film (20a) having a density of 0.925 or more and polyethylene film (20b) having a density of less than 0.925)
By forming a film, the orientation becomes large in the flow direction, and particularly, a polyethylene film having a low density (20b)
Forms a sealant layer (20) having a large heat shrinkage, so that the upper edge hakama portion (16a) and the lower edge hakama portion (1) shown in FIG.
4a) can be a packaging bag (100) that does not curl. It is shown in FIG.
The heat shrinkage of the biaxially stretched nylon film to be 0) is about 2.5%, whereas the sealant layer (20)
This is because the heat shrinkage of the can be approximately 2.5%.

On the other hand, as shown in the partial perspective view of FIG. 4, for example, a conventional boil packaging material using a non-stretched polypropylene film having a heat shrinkage rate of 1.7% for the sealant layer (20) has an upper side. The skirt portion (16a) and the lower skirt portion (not shown) are opened by curling the outer curl, from which the waste in boiling water for boiling (many wastes are generated because many bags are sterilized). Then, the next cooling flattened the skirt and trapped filth.

Hereinafter, materials and the like of the wrapping material for boil of the present invention will be described. First, the packaging material for boiling of the present invention (1)
A biaxially stretched polyamide film is used as the base film (10), and specifically, a biaxially stretched nylon film having a thickness of about 25 μm is suitable. For example, it is flexible in consideration of bending pinhole resistance and the like. Trade name O to which the agent was added
NP (manufactured by Unitika), N2102 (manufactured by Toyobo Co., Ltd.) and the like can be more preferably used.

Further, as the polyethylene film (20a) having a density of 0.925 or more of the sealant layer (20) constituting the boil packaging material (1) of the present invention, a linear low- Density polyethylene (LL
DPE), low density polyethylene (LDPE) having a density of 0.925 to less than 0.930, medium density polyethylene (MDP)
E), high density polyethylene (HDPE). Also,
Examples of the polyethylene film (20b) having a density of less than 0.925 of the sealant layer (20) include linear low density polyethylene (LLDPE) and low density polyethylene (LDP).
E).
25 or more polyethylene film (20a), density 0.
Linear low-density polyethylene (LLDPE) can be suitably used for both the polyethylene film (20b) of less than 925.

[0026]

Next, the present invention will be described in detail with reference to examples. <Example 1> As shown in FIG.
Was prepared as a 25 μm-thick biaxially stretched nylon film.

On the other hand, as the sealant layer (20), a linear low density polyethylene resin having a density of 0.935, a linear low density polyethylene resin having a density of 0.915, and a linear low density polyethylene resin having a density of 0.935 are further provided. Polyethylene resin, T
Each having a thickness of 15 μm, 10
3 layers of 20 μm and 15 μm (20a, 20b, 20a)
Was obtained.

On the base film (10) prepared above,
Using the adhesive for dry lamination as an adhesive layer (30), the above-mentioned three-layer sealant film was laminated to obtain a wrapping material for boiling (1).

<Comparative Example 1> A wrapping material for boil (1) was prepared in the same manner as in Example 1, except that a single-layer film for sealant was a non-stretched polypropylene film having a thickness of 40 µm as the sealant layer (20). Obtained.

With respect to the film for a sealant obtained in Example 1 and Comparative Example 1, its moisture-proof property (water vapor permeability:
g / m ² · 24H) and the measurement results of curl characteristics (thermal shrinkage) at 100 ° C. for 30 minutes are shown in Table 1. Further, using the packaging material for boil (1) obtained in Example 1 and Comparative Example 1, a packaging bag (100) filled with raw noodles was used,
Heat resistance in boil sterilization test at about 100 ° C for 30 minutes,
The curl characteristics are shown in Table 1 above.

[0031]

[Table 1]

As shown in Table 1, the water vapor permeability of the sealant layer of Example 1 was reduced to half that of the conventional unstretched polypropylene film, and the sealant layer had a moisture-proof effect. Further, the heat shrinkage of the sealant layer of Example 1 was larger than that of the conventional one, and therefore, in the boil test of the packaging bag, there was almost no outer curl in the skirt portion. Further, there was no bag breakage and heat resistance could be maintained.

[0033]

As described above, the present invention has the following effects. That is, in a boil packaging material in which the outermost layer is a biaxially stretched polyamide film and the innermost layer is a sealant layer, the sealant layer has a density of 0.9 from the outside.
By forming a multilayer film in which a polyethylene film having a density of 25 or more and a polyethylene film having a density of less than 0.25 are laminated in this order, it is possible to provide a packaging material for boil that is excellent in moisture resistance and can maintain heat resistance.

The multilayer film of the sealant is
By obtaining by co-extrusion using a T-die method or an inflation method with a blow ratio of 1 to 1.5, a multi-layer film having a large orientation in the flow direction and a large heat shrinkage can be obtained, so that a wrapping material for a boiling curl can be obtained. It can be.

Further, by using a packaging bag using a packaging material for boil which is excellent in heat resistance, curl characteristics (inner curl properties) and moisture resistance as described above, when sterilizing the boil on the manufacturer side, it is possible to break the bag or the hakama. No ingress of filth, etc. (sanitary)
It is possible to provide a packaging bag that can be a packaging bag for boiling and that stores biological food that does not dry during distribution and storage (has a long shelf life).

Accordingly, the present invention is intended for use as a packaging bag for storing biological foods or the like using a boil packaging material.
It has excellent practical effects.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing one embodiment of a boil packaging material of the present invention in a side cross section.

FIG. 2 is a view for explaining an embodiment of a manufacturing process of a boil packaging material and a packaging bag of the present invention, wherein (a) is a perspective view of a web-shaped boil packaging material, and (b) is a perspective view. FIG. 3 is a perspective view showing a sealed state for forming a packaging bag, and FIG.
FIG. 4 is a perspective view showing a step of cutting into a packaging bag.

FIG. 3 is a front view illustrating an embodiment of a packaging bag using the boil packaging material of the present invention.

FIG. 4 is a partial perspective view illustrating an embodiment of a conventional packaging bag using a boil packaging material.

[Explanation of symbols]

 Reference Signs List 1 wrapping material for boiling 10 base film 12 side seal 14 bottom seal 14a bottom skirt 16 top seal 16a top skirt 20 ‥‥ sealant layer 20a ‥‥ polyethylene film with density of 0.925 or more 20b ‥‥ polyethylene film with density less than 0.925 30 ‥‥ adhesive layer 40 ‥‥ opening 100 ‥‥ packaging bag H ‥‥ vertical width of packaging bag P ‥‥ Flow direction of web W ‥‥ Width of packaging bag

Continued on the front page F term (reference) 3E067 AA11 AB01 BA12A BA31A BB14A BB15A BB18A BB25A CA05 CA17 CA24 EA06 GC01 GD02 3E086 AD01 BA04 BA15 BA33 BB02 BB41 BB51 CA01 CA03 DA08 4F100 AK04B15A03 BA03 BA08 BAK BAA JA13B JA13C JD04 JJ03 JJ10 JL12B YY00B YY00C

Claims (3)

[Claims] 1. A wrapping material for a boil wherein an outer layer is a biaxially stretched polyamide film and an innermost layer is a sealant layer, wherein the sealant layer is a polyethylene film having a density of 0.925 or more from the outside and a polyethylene film having a density of less than 0.25. A packaging material for a boil, characterized in that it is a multilayer film composed of at least two layers laminated in the order of films. 2. The packaging for a boil according to claim 1, wherein the multilayer film forming the sealant layer is obtained by co-extrusion using a T-die method or an inflation method with a blow ratio of 1 to 1.5. Wood. 3. A packaging bag using the boil packaging material according to claim 1 or 2.